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Thermoelectric generators (TEGs) offer a sustainable solution for thermal energy harvesting, where maximizing energy output necessitates achieving both high power density and high conversion efficiency. However, TEGs with intrinsically high power density by employing high power factor materials, often face efficiency limitations due to their usually high thermal conductivity. Here, we present intrinsically high power density TEGs based on Mg2Sn-GeTe for the first time, simultaneously delivering a remarkable conversion efficiency of 9% under a temperature gradient of 418 K, thereby setting a new benchmark in the field. This exceptional performance is attributed to the significant balance between the moderating carrier and phono transport in Mg2Sn, enabled by a stepwise aliovalent Sb and Bi solid solution, without over-compromising its outstanding power factor. Consequently, a high thermoelectric figure of merit of 1.4 is achieved in Mg2Sn0.8(Sb0.5Bi0.5)0.2. The high-performance Mg2Sn–GeTe TEGs introduced here represent a significant advancement in thermoelectric technology, offering an innovative and efficient solution for off-grid energy supply in waste-heat-rich environments.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: thermoelectric

刊行年月日: 2025-07-30

出版者: Wiley

掲載誌:

• Advanced Science (ISSN: 21983844) vol. 12 issue. 40 e06997

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1002/advs.202506997

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更新時刻: 2025-11-11 08:30:10 +0900

MDRでの公開時刻: 2025-11-11 08:22:16 +0900